#include <iostream>
using namespace std;

string operator+(string&a,string&b)
{
	cout << "新规则" << endl;
	string c="niha";
	return c;
}

int main()
{
	string str1="hello";
	string str2="world";
	string str3=str1+str2;
	cout << str3 << endl;
	return 0;
}
